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MB1SA2V

Single Board Precision DVM with direct PC Interface

Advanced Linear Devices 

MB1S(MB1SA2V)/MB1SA20V

Single Board Precision DVM with direct PC Interface

The ALD MB1S is a precision +/-5½-digit Digital Voltmeter (DVM) printed circuit board that

contains the ALD500R/ALD521D A/D Converter chipset that directly plugs into the parallel printer port

of a PC computer. It features calibrated analog input (w/scalable input ranges), and digital circuitry to

communicate with PC or other microprocessors. It is designed to be used as a stand-alone, embedded

system component in a variety of applications including digital panel meters, customized instrumentation

displays, temperature monitoring, high resolution DVM’s, weigh scales and others. Direct Full-scale

analog input range is +/-2.00000V DC with a linearity of 0.005%. ALD's 18-bit plus sign integrating

dual-slope analog processor (ALD500) functions as the input device and the ALD521D microprocessor

IC implements the digital conversion, control mode and I/O functions.

The MB1S supports two optional versions, each populated with different components and

configurations:

Mode A – calibrated reference used primarily for measurements against a calibrated reference

voltage typically required in precision voltmeter applications. Mode A is the default version of

MB1S.

Mode B – ratio-metric intended for measurements against a ratio-metric reference voltage, such

as those required in weigh scale applications. Mode B is a simple application specific adaptation

of the standard MB1S.

The MB1S board has a provision for PC interface (DB25), BASIC interface modules, and input resistor

divider network for input scaling. Optional MS-DOS Software (P/N - MBCDROM) is also available for

user setup and calibration. Only one copy of the software is necessary, regardless of the number of

boards in use. DC Inputs are single ended or optionally fully differential, and features automatic zero and

automatic input polarity detection. A DB25 connector is provided on-board, to conveniently interconnect

the MB1S to a personal computer (PC) via the parallel printer port for operation, initial setup, and

calibration.

Hardware and Software Features

Directly plug into a PC parallel printer port and displays readings on the monitor.

Measurement Range: +/-2.00000V DC direct input.

(Other ranges are user configurable and scalable, using both hardware and software scaling)

Self-powered from PC computer or external +5V DC power source

All solid-state construction.

24-bit serial output. (23-bit plus sign bit)

User selectable +/-3½ to +/-6½ digits.

Differential analog inputs with auto-polarity and auto-zero.

Simple to install and operate.

Calibration for positive and/or negative inputs.

Provision for input voltage scaling attenuator network.

Smart Input Filtering (Sample Averaging) selection for noise reduction and accurate displays.

Optional MS-DOS software for user operation, setup, and calibration is sold separately.

Rev 2.0 © 2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286

MB1S

www.aldinc.com

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